Surgical instrument



FIG. 1 is a front elevation view of a surgical instrument _showing my new design;

FIG. 2 is one side elevation view with the opposite side _being the mirror image thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view of the surgical instrument; and

FIG. 5 is a bottom plan view of the instrument. 

The ornamental design for a surgical instrument, as shown and described. 